CN107175398A - A kind of SPS diffusion welding methods of molybdenum alloy and tungsten alloy - Google Patents
A kind of SPS diffusion welding methods of molybdenum alloy and tungsten alloy Download PDFInfo
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- CN107175398A CN107175398A CN201710505126.8A CN201710505126A CN107175398A CN 107175398 A CN107175398 A CN 107175398A CN 201710505126 A CN201710505126 A CN 201710505126A CN 107175398 A CN107175398 A CN 107175398A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
- B23K20/026—Thermo-compression bonding with diffusion of soldering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/008—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating pressure combined with radiant energy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/14—Preventing or minimising gas access, or using protective gases or vacuum during welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/16—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating with interposition of special material to facilitate connection of the parts, e.g. material for absorbing or producing gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/24—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Welding Or Cutting Using Electron Beams (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Arc Welding In General (AREA)
Abstract
It is, using titanium foil as intermediate layer, solid-state diffusion welding to be carried out to molybdenum alloy and tungsten alloy by SPS technologies, the connector of molybdenum alloy and tungsten alloy is obtained the invention provides a kind of molybdenum alloy and the SPS diffusion welding methods of tungsten alloy.While can ensureing that mother metal is not recrystallized by the welding method of the present invention, high intensity, the molybdenum alloy of forming and tungsten alloy weldment are obtained, joint room temperature shear strength is up to 296MPa.
Description
Technical field
The present invention relates to the welding of a kind of welding method of xenogenesis refractory alloy, more particularly to a kind of molybdenum alloy and tungsten alloy
Method.
Background technology
Molybdenum alloy is to be added by matrix of molybdenum formed by various alloying elements (such as Ti, Zr, Hf, W and rare earth element etc.)
Alloy, with high recrystallization temperature, excellent mechanical behavior under high temperature and good corrosion resistance, in Aeronautics and Astronautics, nuclear energy
It is widely applied Deng field, such as：Using its excellent mechanical behavior under high temperature, radiation panel, rocket available for spacecraft
Distribution valve body of high temperature etc. is born in the nozzle of engine, torpedo engine；Utilize its good corrosion to liquid metals
Can, available for stirring main shaft made in glass-melting furnace etc.；Can be also used for X-ray rotating anode part, it is die casting, advanced
Isothermal forging mould, the heater in high temperature furnace and thermal insulation layer of difficult-to-deformation material etc..
Tungsten alloy, is the alloy system that the elements such as Re, Ti, Cr composition is added by matrix (85~99wt% of W content) of tungsten,
With high-melting-point, high density, high rigidity, low thermal coefficient of expansion, good corrosion stability and antioxygenic property, excellent conductive and heat-conductive
The excellent properties such as performance and ray absorption capacity, it has also become the national defense industry such as weaponry, Aero-Space, atomic energy field and micro-
The critical material in the sophisticated technology such as electronic information, electrical engineering, machining field, for example：In weapons field, available for superelevation
Fast kinetic energy penetrator；In nuclear fusion field, available for the facing plasma material in fusion reactor TOKAMAK device.
Molybdenum alloy is effectively connected with tungsten alloy, refractory alloy is expanded and is applied in the fields such as Aero-Space, nuclear energy
It is crucial.However, because the physics of both materials, chemical property difference are big (such as different melting points are big) so that company between the two
Connect extremely difficult.The company of high temperature alloy is mainly realized using melting welding, soldering, diffusion welding and partial transient liquid at present
Connect.But there are many deficiencies in these methods：It is difficult to be made the joint of high bond strength；To the cleannes and equipment on metalwork surface
Vacuum level requirements are very high；Temperature needed for diffusion welding and partial transient liquid is high, soaking time is long, causes company between the two
Connect time-consuming, power consumption；Melting welding is easily cracked；Although soldering connection temperature is relatively low, because the fusing point of solder is generally relatively low, because
This soldering is difficult to that the joint that can be used at high temperature is made.
Discharge plasma sintering (Spark Plasma Sintering, SPS) technology is to utilize flash DC current stream
A kind of new method of rapidly solidified shaping is carried out to powder through powder or mould generation Joule heat.In recent years, this method starts
It is used for welding field.SPS welding procedures are to put the material for needing to connect between two electrodes, apply logical while pressure
Enter pulsed direct current, the Solid phase welding processes for making its linkage interface produce atoms permeating using SPS effects and carrying out.With tradition
Solid-state diffusion welding compare, the advantage of SPS solid-state diffusions welding is not only that the rate of heat addition is fast, energy consumption is low, particularly important
It is that SPS introduces electric field on the basis of the temperature field needed for conventional solid Diffusion Welding and stress field.In the presence of electric field,
Electromigration effect can accelerate material to spread.Therefore, it is expected in lower temperature and is realized in the short period to molybdenum conjunction using SPS technologies
Effective connection of gold and tungsten alloy.On the other hand, molybdenum alloy and tungsten alloy occur after high temperature re-crystallization mechanical property can significantly under
Drop.Addition low-melting-point metal or alloy can reduce welding temperature as intermediate layer, it is to avoid molybdenum alloy and tungsten alloy were welded
Recrystallized in journey.Titanium, 1660 DEG C of fusing point, belongs to refractory metal.Titanium can form complete solid solution with molybdenum, tungsten.Therefore, use
Titanium is expected to reduction welding temperature, avoids mother metal from recrystallizing as molybdenum alloy and the intermediate layer of tungsten alloy Diffusion Welding,
High-quality seam organization is obtained, and then improves the mechanical property of welding point.
The content of the invention
For existing refractory alloy, especially molybdenum alloy and the weak point of tungsten alloy interconnection technique, the purpose of the present invention
Be by SPS technologies be applied to refractory alloy solid-state diffusion connection there is provided the rapidly and efficiently weldering of a kind of molybdenum alloy and tungsten alloy
Method is connect, intermediate layer is used as by adding titanium foil, to reduce welding temperature, avoid mother metal from recrystallizing, and is led in weld seam
Cross atom counterdiffusion and form complete solid solution, and then improve the mechanical property of welding point.
The present invention solves technical problem, adopts the following technical scheme that：
The SPS diffusion welding methods of molybdenum alloy and tungsten alloy of the present invention, are, using titanium foil as intermediate layer, to pass through SPS
Technology carries out solid-state diffusion welding to molybdenum alloy and tungsten alloy, so as to obtain the connector of molybdenum alloy and tungsten alloy.Specifically include
Following steps：
Step 1,
Molybdenum alloy and tungsten alloy to be welded is taken, the surface to be welded to molybdenum alloy and tungsten alloy carries out pre-grinding, polishing and surpassed
Sound is cleaned and is dried in vacuo；
Step 2,
It is not less than 99.5% titanium foil as intermediate layer in 20~40 μm, purity from thickness, acid is carried out to titanium foil
Wash, be cleaned by ultrasonic and dry；
Step 3,
Graphite jig is taken, the graphite jig includes seaming chuck, push-down head and graphite former；
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from bottom to top, then with seaming chuck and
Push-down head is compressed, while making titanium foil positioned at the middle position of graphite former height；
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 20~60MPa,
Heating rate is 20~300 DEG C/min,
It is 800~1100 DEG C to connect temperature,
Soaking time is 10~120min,
Rate of temperature fall is：The interval rate of temperature fall for being down to 600 DEG C from connection temperature is 5~30 DEG C/min, from 600 DEG C of drops
To the interval furnace cooling of room temperature；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.
It is preferred that, in step 1, by using #400, #800, #1000, #1200, #1500, #2000 abrasive paper for metallograph successively
The surface to be welded to molybdenum alloy and tungsten alloy carries out pre-grinding respectively, and then polishing is simultaneously cleaned by ultrasonic in alcohol, makes what is handled well
The flatness of the surface to be welded of molybdenum alloy and tungsten alloy is not more than 0.1mm, roughness and is not more than 0.1 μm.
It is preferred that, in step 2, the pickling is that titanium foil is soaked 5 minutes for 5% watery hydrochloric acid using volumetric concentration, institute
Stating ultrasonic cleaning is carried out in alcohol.
Most preferably, welding condition described in step 4 is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from 900 DEG C is 20 DEG C/min, and room-temperature zone is down to from 600 DEG C
Between furnace cooling.
Above-mentioned most preferred welding condition be based on univariate Scientific experimental design, and many experiments grope and
Obtain, on this condition, the combination property of product is optimal.
Compared with prior art, beneficial effects of the present invention are embodied in：
1st, the present invention can realize the rapidly and efficiently connection of molybdenum alloy and tungsten alloy using SPS technologies, with traditional connection work
Skill is compared, and this method connection temperature is low, soaking time is short, energy consumption is low, require low to equipment vacuum degree；Addition titanium foil is used as centre
Transition zone, while promoting atoms permeating by electromigration effect, on the premise of strength of parent is not reduced, realizes molybdenum alloy and tungsten
The efficient connection of alloy.
2nd, while can ensureing that mother metal is not recrystallized by the welding method of the present invention, intensity height, forming are obtained
Molybdenum alloy and tungsten alloy weldment, joint room temperature shear strength is up to 296MPa.
3rd, present invention optimizes molybdenum alloy and the SPS diffusion technology for welding of tungsten alloy, when axial compressive force, the rate of heat addition, company
Jointing temp, soaking time and rate of temperature fall be respectively preferably 50MPa, 100 DEG C/min, 900 DEG C, 30min, 20 DEG C/min when, more
The advantage of the welding procedure can be given full play to, mother metal recrystallization process is effectively suppressed while ensureing to have sufficiently thick diffusion layer
In crystal grain grow up.
Embodiment
Following by embodiment, the invention will be further described, but embodiments of the present invention are not limited only to this.
Discharge plasma sintering stove used in following embodiments is the LABOX- that Sinter Land inc companies of Japan produce
350 discharge plasma sintering systems, its current type is DC pulse current, and pulse train is 40:7；Graphite jig used
Internal diameter is Φ 8mm.
Molybdenum alloy used is TZM alloys in following embodiments, and tungsten alloy used is WRe alloys, both at forging state：
The composition of TZM alloys is 0.4~0.6wt.% Ti, 0.07~0.12wt.% Zr and 0.01~0.04wt.% C, remaining
For Mo (disregarding impurity content), average grain size is 100 μm；The composition of WRe alloys is 24~26wt.% Re, and remaining is W
(disregarding impurity content), average grain size is 10 μm.
Embodiment 1
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.06mm and 0.07 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.09mm and
0.05μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 20 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
296MPa。
Embodiment 2
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.06mm and 0.07 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.09mm and
0.04μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 800 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 20 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
194MPa。
Embodiment 3
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.06mm and 0.08 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.09mm and
0.06μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 1000 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 20 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
137MPa。
Embodiment 4
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.07mm and 0.07 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.08mm and
0.05μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 20MPa,
Heating rate is 100 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 20 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
163MPa。
Embodiment 5
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.06mm and 0.07 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.08mm and
0.05μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 10min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 20 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
201MPa。
Embodiment 6
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.09mm and 0.07 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.08mm and
0.05μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 60min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 20 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
220MPa。
Embodiment 7
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.08mm and 0.06 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.1mm and
0.07μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 20MPa,
Heating rate is 300 DEG C/min,
It is 1100 DEG C to connect temperature,
Soaking time is 10min,
Rate of temperature fall is：The interval rate of temperature fall for being down to 1000 DEG C from connection temperature is 15 DEG C/min, from 1000 DEG C of drops
It is 30 DEG C/min to 600 DEG C of interval rate of temperature fall, the interval furnace cooling of room temperature is down to from 600 DEG C；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
97MPa。
Embodiment 8
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.08mm and 0.06 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.1mm and
0.07μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 20MPa,
Heating rate is 200 DEG C/min,
It is 1000 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 30 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
117MPa。
Embodiment 9
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.07mm and 0.06 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.05mm and
0.08μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 30MPa,
Heating rate is 80 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 60min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 16 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
243MPa。
Embodiment 10
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.07mm and 0.07 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.06mm and
0.1μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 30MPa,
Heating rate is 50 DEG C/min,
It is 1000 DEG C to connect temperature,
Soaking time is 60min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 10 DEG C/min, is down to from 600 DEG C
Room temperature interval furnace cooling；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
115MPa。
Embodiment 11
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.09mm and 0.08 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.05mm and
0.07μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 60MPa,
Heating rate is 20 DEG C/min,
It is 800 DEG C to connect temperature,
Soaking time is 120min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 5 DEG C/min, and room is down to from 600 DEG C
Furnace cooling between warm area；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
149MPa。
Embodiment 12
The molybdenum alloy of the present embodiment and the SPS Diffusion Weldings of tungsten alloy are carried out as follows：
Step 1,
Surface to be welded to molybdenum alloy and tungsten alloy is golden using #400, #800, #1000, #1200, #1500, #2000 successively
Phase sand paper carries out pre-grinding, and then polishing is simultaneously cleaned by ultrasonic in alcohol；The flatness of molybdenum alloy surface to be welded after processing and thick
Rugosity is respectively 0.09mm and 0.08 μm, the flatness and roughness of the tungsten alloy surface to be welded after processing be respectively 0.05mm and
0.07μm。
Step 2,
Titanium foil is placed in the watery hydrochloric acid that volumetric concentration is 5% and soaks 5min, is then cleaned by ultrasonic in alcohol, finally dries
It is dry standby.
Step 3,
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from top to bottom, then uses, push
Head is compressed, while making titanium foil positioned at the middle position of former height.
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to and is less than
8Pa, then passes to DC pulse current, and welding is diffused to molybdenum alloy and tungsten alloy, and welding procedure is：
Axial compressive force is 50MPa,
Heating rate is 200 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 10min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 5 DEG C/min, and room is down to from 600 DEG C
Furnace cooling between warm area；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.After tested, the room temperature shear strength of joint is
210MPa。
The exemplary embodiment of the present invention is these are only, is not intended to limit the invention, all spirit in the present invention
With any modifications, equivalent substitutions and improvements made within principle etc., it should be included in the scope of the protection.
Claims (5)
1. the SPS diffusion welding methods of a kind of molybdenum alloy and tungsten alloy, it is characterised in that：Be using titanium foil as intermediate layer,
Solid-state diffusion welding is carried out to molybdenum alloy and tungsten alloy by SPS technologies, so as to obtain the connector of molybdenum alloy and tungsten alloy.
2. the SPS diffusion welding methods of molybdenum alloy according to claim 1 and tungsten alloy, it is characterised in that：
Step 1,
Molybdenum alloy and tungsten alloy to be welded is taken, the surface to be welded progress pre-grinding, polishing and ultrasound to molybdenum alloy and tungsten alloy are clear
Wash and be dried in vacuo；
Step 2,
It is not less than 99.5% titanium foil as intermediate layer in 20~40 μm, purity from thickness, pickling is carried out to titanium foil, super
Sound is cleaned and dried；
Step 3,
Graphite jig is taken, the graphite jig includes seaming chuck, push-down head and graphite former；
The molybdenum alloy handled well, titanium foil, tungsten alloy are sequentially placed into graphite former from bottom to top, then with seaming chuck and pushing
Head is compressed, while making titanium foil positioned at the middle position of graphite former height；
Step 4,
The graphite jig that will be equipped with to-be-welded pieces is placed in the burner hearth of discharge plasma sintering system, is evacuated to less than 8Pa, so
After be passed through DC pulse current, welding is diffused to molybdenum alloy and tungsten alloy, welding procedure is：
Axial compressive force is 20~60MPa,
Heating rate is 20~300 DEG C/min,
It is 800~1100 DEG C to connect temperature,
Soaking time is 10~120min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from connection temperature is 5~30 DEG C/min, and room is down to from 600 DEG C
Furnace cooling between warm area；
The connector of molybdenum alloy and tungsten alloy is obtained after cooling.
3. the SPS diffusion welding methods of molybdenum alloy according to claim 2 and tungsten alloy, it is characterised in that：
In step 1, by using #400, #800, #1000, #1200, #1500, #2000 abrasive paper for metallograph successively respectively to molybdenum alloy
Pre-grinding is carried out with the surface to be welded of tungsten alloy, then polishing is simultaneously cleaned by ultrasonic in alcohol, the molybdenum alloy handled well is closed with tungsten
The flatness of the surface to be welded of gold is not more than 0.1mm, roughness and is not more than 0.1 μm.
4. the SPS diffusion welding methods of molybdenum alloy according to claim 2 and tungsten alloy, it is characterised in that：In step 2,
The pickling is that titanium foil is soaked 5 minutes for 5% watery hydrochloric acid using volumetric concentration, and the ultrasonic cleaning is entered in alcohol
OK.
5. the SPS diffusion welding methods of molybdenum alloy according to claim 2 and tungsten alloy, it is characterised in that：Described in step 4
Welding condition is：
Axial compressive force is 50MPa,
Heating rate is 100 DEG C/min,
It is 900 DEG C to connect temperature,
Soaking time is 30min,
Rate of temperature fall is：The interval rate of temperature fall that 600 DEG C are down to from 900 DEG C is 20 DEG C/min, be down to from 600 DEG C room temperature it is interval with
Stove is cooled down.
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